That's highway robbery. Figure iridium plugs are $6 each so 8 are $48.
I know you said you don't want to do it yourself but plugs on a 4Runner are one of the easiest DIY automotive tasks there is. If you can change the oil you can do plugs. Seriously, its so easy to do with just a rachet, sockets and extensions, just don't overtorque the plugs and strip the threads in the cylinder heads.
If you REALLY don't want to do it get a quote from a small shop, this is not a job that requires a Toyota tech to do. Even better, find a buddy who has a small bit of knowledge and give him beer to do it or to help you